/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieSceneRootOverridePath.h
Return the number of generations between the root and the specified sequence ID
The number of generations between the two nodes. (ie, 0 where SequenceID == Root, 1 for Immediate children, 2 for grandchildren)
int32 NumGenerationsFromRoot ( [FMovieSceneSequenceID](API\Runtime\MovieScene\FMovieSceneSequenceID) SequenceID ) const